Kikaisan

As the mind behind Soul Society's Research and Development Institute, Mayuri Kurotsuchi has produced a long catalog of specialized gear and chemicals, and Kikaisan points to that body of invention. His creations blur the line between laboratory apparatus and battlefield weapon, reflecting a scientist who treats nearly every encounter as another experiment to run.

The lineup spans biology, chemistry, and hardware. Among his engineered organisms are flesh bombs implanted in his own subordinates and set off by remote, surveillance bacteria seeded into fleeing enemies, and a regenerative serum that regrows severed limbs. His pharmacology runs from a superhuman drug that stretches a single second into a subjective century to blood-rewriting and postcognition compounds. On the hardware side he has built Reishi-locking spheres that freeze incoming spirit particles, an anti-Arrancar mine keyed to their Reiatsu, a device that manufactures Garganta portals, luminescent armor that detonates to free him when he is crushed, and animate gadgets such as an umbrella-like shield and a face-bearing binding cord. He has also mastered Gigai and Modified Soul work, embodied in his lieutenant Nemu, and offers repairs or alterations to Zanpakutō.

Nearly all of these tools are the personal handiwork of Mayuri Kurotsuchi, who fields them against opponents including the Espada Szayelaporro Granz, the invading Sternritter, and the Soul King's severed arm, Pernida Parnkgjas. His daughter and lieutenant, Nemu Kurotsuchi, is herself one of his creations and stores several of his compounds within her body.